Typewriting machine



Aug. 8, 1939. H. L. PITMAN TYPEWRITING MACHINE Filed Jan. 28, 1936 6 Sheets-Sheet l INVENITOR {a ATT o RNEY Aug. 8, 1939. H. L. PITMAN TYPEWRIT ING MACHINE Filed Jan. 28, 1936 6 Sheets-Sheet 2 INVENTOR i f? TORNEY Aug. 8, 1939. H. PITMAN TYPEWRITING MACHINE Filed Jan. 28, 1936 6 SheetsSheet 4 g- 8, 1939- H. L. PITMAN 2,168,448

TYPEWRI TING MACHINE Filed Jan. 28, 1936 6 Sheets-Sheet 5 ATTORNEY H. L. PITMAN Aug. 8, 1939.

TYPEWRI TING MACHINE Filed Jan. 28, 1936 6 Sheets-Sheet 6 Patented Aug. 8-, 1939 UNITED STATES PATENT OFFICE TYPEWRITING MACHINE Henry L. Pitman, Hartford, Conn assignor to Underwood Elliott Fisher Company,

New

This invention relates to typewriters and more particularly to typewriters in which a platen is rotated a predetermined number of line-spaces at one time.

A feature of the invention is the provision of means that rotates the platen to present the first line of a succeeding form irrespective of the number of lines imprinted on the preceding form, on a continuous work-sheet.

A feature of the invention is the provision of means for the automatic feeding of a work-sheet as above set forth by an automatic carriagereturn mechanism.

Another feature of the invention is the provision of means for the rotation of the platen to feeda work-sheet by means of a screw mounted on the platen-shaft, and a toothed wheel interengaging with the screw and held stationary during the carriage return, whereby the worksheet is fed forwardly each time to the predetermined initial line.

Another feature of the invention is the provision of means for lifting and for holding the platen-detenting roll out of engagement during the automatic rotation of the platen and its automatic engagement with its notched 'wheel at the initial line of each successive work-sheet, and preventing normal line-spacing. during the automatic feed.

Another feature of the invention is the provision of means that inaugurates the carriage return and the automatic work-sheet feed by the single operation of tripping a key on the front of the typewriter.

Another feature of the, invention is the pro-v vision of a toothed wheel fast-on the platen and a stop co-operative therewith to prevent overthrow of the feed mechanism, and of the worksheet, during the automatic rotation of the platen. 4

Another feature of the invention is the provision of means that automatically stops the carriage-return mechanism concomitantly with means that automatically stops the automatic rotation of the platen.

Another feature of the invention is the pro-' vision of mechanism to throw out the platendetent roll and to lock the line-space mechanism by power, which is done by automatically connecting said mechanism to the power-driven carriage-return rack.

Another feature of the invention is the provision of means that presents the first line of a lines imprinted on the preceding form, said means permitting setting for forms of different size.

vision of means for automatically rotating the platen a predetermined total number of linespaces less the number of line-spaces the platen has'been. already rotated by said line-spacing mechanism.

Another feature of the invention is the provision of a shaft mounted on the platen-shaft for rotation therewith and having a helical screw and ,means mounted on the frame which by the motion of the car age-return acts on said screw to line-space the platen.

Another feature of the invention is the provision of a. covering for the helical screw and the coacting mechanism which keeps out dust and dirt and protects the parts from accidental injury or displacement, as well as protects the operator.

Other features of the invention are the provision of various improved mechanical constructions, positive in action and durable in construction, contributing in whole or in part to the performance of the novel functions above set forth.

Other features and advantages will hereinafter appear.

In the accompanying drawings:

Figure 1 is a perspective view with some of the parts sectioned-showing the imprinting of the first or head line on a telephone-toll bill form.

' Figure 2 is a section through the right end of the platen, showing the aperture for assembling the screw-shaft at the left end of which shaft a pick-up arm is shown, but. omitting the central solid platen-shaft.

Figure 3 shows a part of the automatic platenrotating assembly, at the left the overfeed stop for engagement with the ratchet on the right end of the platen as shown in Figure 1 and the spring mounting for the movable. stop-tooth which interengages with a tooth on the screwwheel.

Figure 4 is a right-end elevation, partlyin section, showing the automatic carriage-retum link'locked behind its keeper and the new bill key in the normal, inoperative position.

Figure 5 is a perspective view of the screwwheel assembly with the parts separated.

Figure 6 is a plan view with the left end of the platen in section and other parts broken away,

and with the mechanism in position for typing a line of a bill.

Figure 7 is a perspective view showing a modification to permit normal line-spacing to an aggregate extent of more than one platen returned position before the dropped to the left one space to the first writing rotation before the automatic rotation of the platen is inaugurated.

Figure 8 is a perspective showing the extreme carriage has position, with the hollow screw-shaft arm abutting the inside platen-pin, and the latched carriage-return rack locking the line-space lever and holding the line-space detent released, although the new bill lever has been restored to normal position.

Figure 9 is a vertical section through the platen near its left end and showing the carriage returning and the line-space detent-roll thrown out.

Figure 10 is a front elevation, a central portion being broken out, showing the beveled edges of the stop on the back of the carriage-return rack and of the lever-plate interengaging in the latched position, after the detent-arm has been disengaged, but before the line-space pawl has .engaged its platen line-space ratchet-wheel.

Figure 11 is a perspective, with parts in section and parts broken away, the carriage being advanced to the extreme left and the automatic carriage-return trip. being released and about to close the clutch, and the inside platen-pin turned about half a. platen rotation away from the screw-shaft arm.

Figure 12 is a pe'rspective'of the screw-wheel mounted on the helically grooved shaft and the positions of the coacting parts after the carriage has returned one letter-space and before the work-sheet is automatically fed, the detenttooth being in line with the screw-wheel, but the fixed bracket-tooth at the right of the screwwheel still out of engagement therewith.

Figure 13 is an end view of the parts shown in Figure 9,.but with the parts in the normal position, and the detent-roll in engagement witlrth platen ratchet-wheel.

Figure 14 is a side elevation, partly in section, viewed from the rightrs howing the carriage released and advancing or jumping to the extreme left as the new bill key is depressed.

- Figure 15 is a perspective view showing a telephone toll bill in the first print position, and the automatic platen-rotating mechanism.

Figure 16 is a right side elevation showing the automatic carriage-return mechanism in the no mal or inoperative position.

' A work-sheet 20 as shown is continuous with repeating identical forms demarcated by lines of weakness to facilitate their separation by tearing after the typing thereon has been completed. The

forms as illustrated are prepared for telephone toll billswor invoices. There is variation in the number of items or toll charges imprinted on each form, so that the number of lines to be typed on each form is a variable, but the next form must always start on the first line. The invention is shown embodied in an'Underwood standard type? writer having a frame 2 I, a front-plate cross-piece 22, having a front carriage-rail 23, a front carriage-roller 24, and a carriage-frame 25, having a front piece 25. No case shift need be provided for typing telephone toll bills. Type-keys 21 .op-, erate the usual type-bar 28. A platen 29 has an inner cylindrical chamber for purposes which will appear hereinafter and feed-rolls 30 engage the platen for feeding the work-sheet.

An automatic electrically-operated carriagereturn is shown herein, which may be operated .by a trip-finger 3| adjacent the keyboard on the front of the machine, which actuates a cam 32 which is mounted on the forward end of a link 33, normally locked in the forward position by a keeper or latch 34, which lies in a notch 35 cut out in the under surface of the link 33. A spring 36 tied to the frame tends to draw the link rearward to actuate a switch and a clutch on the rear of the type vriter-frame.

An automatic starting of the carriage-return is effected by the following construction. A horizontal pin 31 in the side of the link 33 is positioned to engage a rock-lever 38 mounted on a stud 39, which in turn is positioned in the side of the frame 2|. A pivot-pin 40 connects the forward end of the rock-lever 38 with the upper vertical link 41, which is pivoted at its upper end to, an ear .42, extending forwardly from a plate 43 screwed fast on a tooth-bar 44 which is mounted on arms 45 loose on a rock-shaft 46, which has a longitudinal groove and is mounted in the sides of the frame. A line-end margin-stop 41 is slidable on the shaft 46 and adjustably lockable by the teeth of the bar 44. At the left end *of the stop 41' is a stop-post 48, and a cam-pawl 49 is pinned on the side of the post 48 and overlies the bar 44. These parts are shown in Figures 1 and 4 in their normal or inoperative position, and in Figure 11 depressed and tripping the automatic carriage return. A forwardly-extending lug 58 on the front piece 25 of the carriage-frame depresses the cam 49, as it overrides it to engage the stop-post 48, to depress the bar 44 and trip the link 33 to actuate the carriage-return switch and'clutch.

An arm 5I is mounted on a rock-shaft 52 and is pivotally connected with the link 33. An arm 64 is also mounted on the rock-shaft 52 and is connected by a link 53 with an arm 54, which is tied to and rocks a shaft 55 on whichis secured a cam-arm 56, which continuously lies in an an nular groove 51 which is integrated with a gearpinion 58, also in turn integrated with a jaw 59 of a clutch with which it is rotatable as a unit on a shaft 60 on which is fixed a complementary clutch-jaw 6|. Fast on the rear end of the shaft 60 is a wheel 62 driven by worm-gear 63 enclosed h in a housing 65 and operated byan electrical motor which therefore returns the carriage through the engagement of the driven pinion 58 with a rack 66. A link I92 may be pivotally. connected with the shaft 52 to actuate a motor startingand stopping switch I93 represented merely Fdiagrammatically in Figures 4 and 16.

A line-start margin-stop 61, Figure 8, provided.

with a toothed detent-arm 68 engaging a vertically notched rod 69, has an arm I0 slidable on and splined to the grooved rock-shaft 46 to rock the latter and the arm I0 carries a vertical camplate 'II which normally; lies in the path of the carriage-lug 58. A stopi-lug I2 extending rearwardly from the margin-stop engages a counter-stop 13 mounted on the front piece 25 of the carriage-frame. Referring to Figure 16, an arm I4 fast on the rock-shaft 46 is pivotally connected with a link 15 which in turn is pivoted to a slidearm 16 provided with a slot 11 fitting a guide-pin I8, mountedon the frame of the typewriter, said slide-arm being connected to'the rock-shaft 55, Figure 11', for automatically disengaging the clutch 58, 6!, and stopping the motor when the carriage-lug 50 engages the arm I0 and thereby rocks the shaft 48 to end the carriage-return run.

The automatic feed Of the continuous worksheet 20 by means of the automatic carriage-re- 1 turn mechanism, which has been described above,

in one embodiment of the invention is procured -by the following mechanism. A "new bill key 19 mounted on the front of the typewriter is adapted to be depressed only while the carriage is feeding to the left and actuates a lever 88, which is pivotally connected with an arm 8| which has a vertical extension 82, the edge of which lies in the path of a cam 83 mounted on the under side of the front rail 25 of the carriage. A shoulder 84 on the arm 8|, in the depressed position of the arm 8|, engages under a bracket 85, which is mounted by means of cars 86 on the frame 2|. A spring 81 holds the shoulder 84 latched in the bracket 85. The lever 88 is pivoted at the rear on a rod 88 mounted in the frame of the machine, and a coil-spring 89 also mounted on the frame tends to hold the lever 88 in the upright position. The arm 8| holds the new bill key 19 down in its operative position-until the cam 83 moves, by the return of the carriage into engagement with the vertical extension 82 to release it. The cam 83 is so positioned on the front of the carriage that it engages the post 82 after the beveled edge of a stop I88 (Figures 8 and 11) is interengaged with a beveled edge |9I of a lever-plate I81, as will be hereinafter described.

Link 98 intermediately pivoted on the keylever 88 is also pivotally connected with an arm 9I fast on a rock-shaft 92 mounted in the frame of the typewriter. Hook-arm 93, Figure 4, fast on the rock-shaft 92, engages a pin 94 mounted at the rear end on the side of a rock-arm 95 pivoted on a pin 96 fast on the frame, said arm 95 carrying a roll-wheel 91 which underlies and engages an escapement-rack 98, so that when the "new bill key 19 is depressed, the roll-wheel 91 lifts the rack 98 up off an escapement-pinion 99, which has an escapement-wheel I88. Arms I8I mounted on pivot-studs I82 at the ends of the carriage beneath the platen 29 support the escapement-rack 98. Aspring-drum I83 for feeding the carriage actuates a tape I84, which is secured to the carriage. The disengagement oi the escapement-rack 98 from the escapementpinion 99 permits the carriage to travel to the end of a line under the power of the spring-drum I83, and also permits the carriage-lug 58 to engage the cam 49 of the stop 41, thereby inaugurating the electrical automatic return of the carriage, as clearly shown in Figures 4 and 14.

The mechanism for lifting and for holding the platendetent-roll out of engagement with the platen, and also for locking the line-spacing mechanism during the automatic platen feed of the work-sheet 28, is now described. A leverplate I85 is secured by screws I86 to the rockshaft 92, and is provided at its too with a forwardly turned edge for engaging a lower extension I 88 of the lever-plate I81, and the latter is secured on a rock-shaft I89 mounted in the carriage-frame. Screw-collars II8 (Figure 1) hold the shaft I89 adjustable, sidewise on the carriage, in the ends of the frame 26. At the right end of the carriage, on the rock-shaft I89, is secured an arm III which engages the under side of the rear end of a lever plate I86, which will be hereinafter described.

A finger-arm II2 (Figure 1) ismounted on the left end of the shaft I89 rockably therewith, and has fingers II3 which grip the upper flat extension of a bracket I32 hereinafter described, and proximate to the left end of a back crosspiece II4 of the carriage. A detent-arm II5 (Figures 9 and 13) pivoted on the left end of the carriage carries a detent-roll H6 and a side arm H1, mounted on a pivot-pin H8, is limited in movement by a stop-pin II9, while-a coil-spring I28 holds, the arm H1 in its predetermined relationship to the detent-arm II5.

An end-bracket I2I (Figures 6, 9 and 13) formed on an extension I35, Figure 6, from the rear of the carriage and coacting elements provide for the usual automatic line-spacing. An idler-pinion I22 engages a side rack I23 mounted on the left end of the carriage-return rack 66. A lower lateral extension I24 from the bracket I2I carries the idler-pinion I22, and is apertured 'to form a bearing for a segmental gear I 25, which meshes with said pinion I22 and is mounted on the lower end of a central post I26, which carries fast on its upper end a lug-collar I21, which engages and actuates a stop-arm I28 mounted on a line-spacing slide I31. A collar I29 on the post I26 supports a pin I38 working as a spline in a vertical slot I3I in the bracket I32, which is also mounted on the post I26, and has at the lower end a cam-arm I95, which in the upper position of the bracket I 32 engages the side arm II1 on the detent-arm II5. A screw I33 adjustably secures the collar I29 on the post I26. A coil-spring I34 surrounds the post I26 and tends to hold the-bracket I32 in the lower position.

A ratchet-wheel I36 (Figures 6, 9 and 13) for line-spacing the platen is mounted on a platen- .shaft I45. The line-space slide I 31 has pivoted thereon in a position suitable for engagement with the ratchet-wheel I36, a lever I38 carrying a pawl I39, and is slidably mounted on superstructure |48 (Figure 1) on the side of the carriage. spaces is controlled by the setting of a controllug I99 and its handle 288, and an overthrow stop I98 limits the extent of line-spacing movement of the lever I38. As shown in Figure 10, tongues I91 at either end of a rack-supporting bracket I42, as shown in Figure 4, and companion slots I96 in the rack-bar 66, slidably support the lat ter, thereby permitting the rack to move endwise relatively to the carriage to operate the linespacing mechanism before returning the carriage. A hand roller I4I is mounted on each end of the platen-shaft I45. The bracket I42, which supports the rack-bar 66, is fastened by screws I43 on the under side of the back crosspiece II4 of the carriage in a position in front of a rear carriage-rail I44.

The platen-shaft I45 (Figure 6) has at the left end a ball-bearing race I 46 to take up the friction of the endthrust of the platen 29 during the automatic rotation'of the platen to feed a work-sheet. A left end-plate I41 on the platen 29 carries an inwardly-extending pin I48, which is parallel to the shaft I45 and to a hollow shaft I49, which fits rotatably on the platen-rod I 45, and carries a stop-arm I58 radially mounted and engaging the pin I48. The hollow shaft I49 is loosely and rotatably mounted on the platen-shaft I45, so that the platen 29 and the pin I48 can turn freely in linespace rotation independently of the hollow surrounding shaft I49 and therefore away from the stop-arm I58. This construction permits the platen to turn freely when line spaced by the usual line-spacing mechanism, but the hollow shaft I49 does not'turn. The left end of the platen 29 has a rotatable bearing on the shaft I45, in a side piece I45 mounted on the carriage, and the other end of the platen bears on the hollow shaft I49. The platen has a hard rubber outer surface I5I, and a hard inner layer I52,

Line-spacing for one, two or three linewhich provides a hollow chamber between the inner wall of the layer I52 and the rotatable shaft I49. The platen is secured on the shaft against turning by aset-screw I53. The platen has a right end-plate I54 afiixed thereon, and.

over this end-plate is mounted for rotation with the platen an eight-toothed wheel I55, which serves to prevent overthrow during the automatic feeding of the platen as hereinafter described.

The hollow shaft I49 hasin its outer surface a helical groove or screw I56. A slot I51 in the end-plate I54, which isclearly shown in Figure 2, permits the insertion of the hollow shaft I49 and its radial arm I56 into the hollow chamber in the platen 29. Y At the extreme right end of the hollowshaft I49 is secured a wheel I58 (Figure 8), which has eight equidistant and equally spaced notches thereon, and a detent-lever I59 pivotally mounted in the side frame of the carriage lies in spring pressed contact with one of the notches by the tension of spring I66 secured to the opposite end of the lever and to the side of the carriage. The detent I59 holds the hollow shaft I49 with its helical groove I56 against rotation unless the shaft is positively actuated by the carriage return. A .wheel I6I is provided with eight equidistant teeth, and is secured to a Babbitt casting I62 provided with an internal helical ridge or screw thread I63 of the same form and pitch as the helical groove I56, in which it is continuously riding. In order to assure perfect conformity the Babbitt casting I62 may be cast directly over the shaft I49 and its groove I56. The

pitch of the helical groove I56 and of the helical ridge or screw I63 is such that the hollow shaft I49 may be rotated by the movement of the carriage with reference to the toothed wheel I6I when the latter is secured against rotation.

A reciprocating rod I64 (Figure l) is slidably mounted at'the left in a block I65 attached to the top of a type-bar segment I66 and at the right in a' plate I61, which is mounted on the frame 2I by spacing screws I68. A bearing-block which the teeth of wheel I6I turn between aleft yoke-stop I 18 and a right yoke-stop I14, each yoke having diametrically opposed friction edges for sidewise engagement with the toothed wheel I6I. A toothstop I15'is pivoted for movement toward and away from the toothed wheel I6I on a rod I16 which is supported on and under the bracket "I in the depending ears I11, and a coil-spring I18 has one end tied tothe bracket, and the other end to. the toothed arm I16 in such a way that it is constantly tending to lift the tooth I15 into such a position thatit would be within a circle parallel to the circumference of the toothed wheel I6I and interposed between the right side of said wheel I6I and the right yoke stop I14 as in Figure 4.

A tooth I19 (Figures 1 and 3) is mounted in the'bracket I1I in such a position that it intercepts the teeth on wheel I55, and it reciprocates in a slot under the control of a coil-spring I86 surrounding its supporting shaft, It is obvious that as the right endof the platen approaches the bracket I1I, the-tooth I19 engages with one of the teeth of the wheel I55 to positively check further rotation of the platen 29. A flat yokesrging I6I bears on the babbitt I62 and holds the w eel I6I and the bracket "I back, when the carriage drops to the first writing point to release the overthrow tooth I19 from the wheel I65.

A screw fastening I62 on the back cross-piece II4 (Figure 11) of the carriage supports the rear end of a table I89, which carries at its edges'forwardlyextending ears I64, in which is mounted a rod I86 to which is fastened the lever-plate I66 by means of screws, or any other suitable means, the lower end of said plate being in engagement with a depending" and rearwardly ex? tending cam-jaw I61 of tooth-stop I16.

' Referring to Figures 8, 9 and 16, the stop I98- .mounted on the back of the rack 66 has a vertiment of the carriage and therefore prevents feed by the line-space pawl I99, and holds the detentroll' I I6 out of engagement with the platen during the return movement of the carriage.

A tooth I94 formed in the bracket I" to the right of the notch I12 engages a tooth of the wheel I6I following the operative engagement of the tooth-stop I16 witha tooth on this wheel.

Referring to Figure 7, a modification is shown of the interlocking structure included in pin I48 and arm I66 at the left end of the platen. A supporting block 26I is mounted on the inside of the platen and carries a finger 262, pivotally.

mounted, for movement of its free end in the general direction of the axis of the platen, of a pin 269, the end of which finger travels in a helical groove 264 of the hollow-shaft I49. Stoppin 266 in the left end of the groove provides the actuating stop for the finger 262. This modification provides a construction which permits the use of a work-sheet form having more linespaces than those provided by a single rotation of the platen. A second stop 269 is provided inthe right end of the groove .264.

A paper-chute may be provided having walls I69 (Figure '6) which may be held securely by a tie-rod I96. The platen extension plate I61 may be adjusted by substituting for one of the spacing screws I66 a screw provided with an adjusting nut 266. A dust and dirt protective covering and guard 261 may be provided and fastened on a paper-table266, see Figure 4.

Operation of the automatic line-space feed Upon pressing downthe new bill" key 19 (Figure 6), wheel 91 lifts the escapeme'nt-rack 96 up oil. the escapement-pinion 99, thereby permitting the carriage to feed underthe power of the usual spring-drum I69 (Figure 14) up to the last predetermined letter-space .at which the carriage-lug '66 (Figure 1) engages the pivoted cam 49 to rock the lever 38, lift the pin 91, and trip the link 66 over the; keeper 94 and so close the switch I99- (Figure 4) and the clutchjaws 69, N to inaugurate the automatic carriagereturn. The wheel I6I (Figure 5), fast to piece I62, with the helical screw I63, is riding in the helical groove I66 at the extreme end position" before the carriage starts to return.- Upon the first letter-space movement of the carriage to the I right in returning, the toothed wheel I6I has moved rightward into the plane of the retracted tooth-stop I15, as shown in Figure 12, and also into the plane of the tooth I94 to enable the latter to check the proximate tooth of the eight equidistant and equally spaced teeth on the wheel I6I. As the carriage return continues, the wheel I5I and bracket I1I are idly carried along until checked by means of the stop-collar I10, whereupon the hollow shaft I49 rotates, through further return of the carriage, in the line-space feeding direction until the arm I50 (Figure 1),

\ engages the pin I48, or, in the modification shown in Figure '7 finger 202 turns in groove 204 until it engages the stop 205, and simultaneously thereafter the shaft turns with the platen 29 in the line-spacing direction for the total number of predetermined line-spaces, in eighths of a platen rotation, according to the setting of the collar I10 (Figure 6) on the reciprocating rod I64, mounted in the block I65 and the bracket-plate I61. In the extreme returned position as shown in Figured, the margin-stop 13 (Figure 8) interlocks with the stop-lug 12 and the carriage-lug 50 overrides and actuates the cam-plate II to tip down the arm 10 and so disengage the carriage-return switch and the clutch. At this time also the spring-pressed tooth I19 interengages with the proximate of the eight teeth on the toothed wheel I55, which is fast on the platen, to prevent overthrow of the line-space feed, and the detent-lever I59 is engaging one of the eight notches in the wheel I58. The collar I10 meanwhile has abutted the inner wall (of bracket-plate I61, thereby preventing further movement of the rod I64.

In the first printing position on a new form as shown in Figure 15, the carriage has dropped back one letter-space, but the yoke-leaf spring I8I, which'bears on the left end face of the piece I52, has prevented the screw-wheel "H, the yokes I13, I14, and the overthrow tooth I19 from following the carriage, thereby releasing the tooth I19 from the toothed wheel I55, so that the operator can turn the platen by the hand roller I at the left, if desired. After the first letter-spacing in the printing position the carriage has moved two letter-spaces, or two-tenths of an inch, to the left, so that the wheel I6I has moved over to the left side of the notch I12 out of contact with the yoke I14 and into contact with the yoke I13 and out of the path of the tooth-stop I15, causing the latter to interpose itself again between the yllgre I14 and wheel I6I, so that said wheel I6! is now free to turn idly on the shaft I49 during an'ordinary carriage return, that is, one not accompanied by-form-feeding. Referring'to Figure 6, the carriage return for one letter-space has rotated the wheel I6I only, and for the next letter-space the carriage moves with the wheel but without taking along the bracket HI and then for three letter-spaces with the bracket I1I. As shown in Figure l, the carriage has advanced eight more letter-spaces together with the bracket HI, and the inner end of the bracket I1I now abuts the supporting block I65, and prevents further movement of the rod I64 to the left. Further leftward movement of the carriage then results in bringing the wheel toward the right end of the groove I56. As the platen is normally letter-spaced the pin I48 moves away from the arm I50, so that in causing the rotation of the shaft I49 automatically it does not line-space the platen until it has picked up the space between the pin I48 and the arm I50, that is, the number of line-spaces already used, and continues then to turn the platen the number of line-spaces remaining from the predetermined whole number, so that the total combined line-spacing is always the same, and the position is always the first line on the next form irrespective of the number of line-spaces already advanced by the usual line-space lever. To decrease the rotation of the platen one-eighth, the collar I10 is moved two letter-spaces or twotenths of an inch to the ieft, and to increase the rotation of the platen one-eighth, the collar I10 is moved two letter-spaces or two-tenths of an inch to the right. In the present embodiment of the invention, the pitch of the groove I56 is such. that each one-sixteenth of a rotation is equivalent to one letter-space or to one-tenth of an inch of carriage travel.

Operation of the Zine-space feed mechanism During the printing of a form at the end of each line the automatic carriage return is set in motion by the engagement of the carriage-lug 50 and the cam-plate 1I (Figure 8). The gearteeth on the side of the rack 66 initially engage the idler-pinion I22 (Figure 9) and through it the segmental gear I25, to rotate the post I26 and "the lug-collar I21 into engagement .with the arm I28 projecting perpendicularly from the line-space slide I31 to which is pivoted the linespace lever I38 and its pawl I39, so that the initial return movement of the carriage-rack line-spaces the platen for one, two, or three linespaces according to the setting of the handle 200, simultaneously moving the pin I48 away from the arm I50, or, in the modification shown in Figure 7, moving the. finger 202 away from the stop 205. This operation is continued at the end of each line on the form, and the pin I48 continues to move away from the arm I50, or the finger 202 away from the stop 205, as the platen is line-spaced. When, however, the new bill key 19 (Figure l) is depressed the plates I05 and I01 rotate the rock-shaft I09 to lift the finger-arm II2, which has fingers II3 gripping the top plate of the bracket I32 mounted on the post I26. The lower edge of the bracket I 32 is in the form of the extending cam-arm I95 (Figure 13). The collar I29 adjustably secured on the post I26 by the set-screw I33 supports the pin I30, slidable in the slot I3I in the bracket I32, which limits the vertical movement of the bracket against the coil-spring I34, from the position shown in Figure 13 to that shown in Figure 9. In the upper position of the bracket I32 as the return rack 66 moves, the segment-gear I25 carries the arm I95 into engagement with the arm II1, pivotally secured to the detentarm II5 which carries the'usual detent-roll H6 at the end, and so moves the detent-roll out of engagement with the platen ratchet-wheel I 36,

but, as shown in Figure 10, the bevel edge of stop MS from turning on the platen-shaft I45, the

wheel ISI turning idly in the notch I12.

Variations may be resorted to within the scope of the invention, and portions of the improve- .ments may be used without others. I

Having thus described my invention, I claim:

1. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, power-operated cairriage-retum mechanism, a key, and means automatically operative under control of said key to return said carriage by means of said carriage-return mechanism and concomitantly, by means of said power-return of the carriage, rotate the platen a predeterminedtotal number of line-spaces less the number of line-spaces theplaten has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented by means of the power-operated carriage-return and irrespective of the number of lines imprinted on the preceding form.

2. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, poweroperated carriage-return mechanism, a carriagereturn key associated with said carriage-retum mechanism, a special key, means, automatically operative upon the depression of the special key,

to return said carriage by means of said carriagereturh mechanism, and platen-rotating mechanism rendered effective by said depression of said special key to operate by means of said powerreturn of the carriage, to rotate the platen a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented by means of the power-operated carriage-return irrespective of the number of lines imprinted on the preceding form, said first key being used for returning said carriage by power without operating said platen-rotating mechanism.

, 3. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, means for automatically returning the carriage, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, and means automatically operative by the automatic carriage-return mechanism to'rotate the platena predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a. continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form.

4. In a typewriter, in combination, a frame,

I a carriage mounted. for reciprocatory movement carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line spacing mechanism for rotating the platen, and means comprising a screw, one member of which is mounted on the carriage ,and the other member on the frame, automatically operative to rotate the platen a predetermined total number of line-spaces less the munber of line-spaces the platen has been already rotated by said linespacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form.

6. In a typewriter, in combination, a. frame, a

carriage mounted for. reciprocatory movementthereon, a platen rotatably mounted thereon,

line-spacing mechanism for rotating the platen, and means comprising a screw, one member of which is mounted on the carriage and the other member on the frame, the pitch of said screw being such that one member may be turned with reference, to the other member, by the relative movement of the carriage and the frame, automatically operative to rotate the platen a predetermined total number of line-spaces less the number of line-spaces the platen has been @1- ready rotated by said line=s-pacing mechanism, whereby in a continuous work-sheet the first line of a succeeeding form is automatically .present'e'd irrespective of the number of lines already imprinted on the preceding form.

'7. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, and means comprising a screw, one member of which is rotatably mounted on the platen-shaft and engageable with the platen and the other member mounted on the frame, automatically operative I to rotate the platen a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said linespacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form. r

8. In a typewriter, in combination, a frame, a

carriage mounted for reciprocatory movement .thereon, a, platen rotatably mounted thereon,

line-spacing mechanism for rotating the platen, means comprising a screw, one member of which is mounted on the carriage and the other member on the frame, automatically operative to rotate the platen a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous worksheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form, and a combined guard and cover over said members.

9. In a typewriter, in combination, a frame,- a carriage mounted for reciprocatory movement thereon, a platen having an axial shaft and rotatably mountedthereon, line-spacing mechanism for rotating the platen, and means comprising a hollow screw shaft rotatably mounted on the platen-shaft automatically operative to rotate the platen a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form,

10. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen having an axial shaft and rotatably mounted thereon, line-spacing mechanism for rotating the platen, and means comprising a hollow screw shaft rotatably mounted on the platen shaft, one end of the platen having a bearing thereon, automatically operative to rotate the platen a predetermined total number of line-spaces less the number of line-spaces.the platen has been already rotated by said line-spacing mechanism, whereby in a continuous worksheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form.

11. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, and means comprising a central platen shaft, a hollow cylindrical shaft rotatably mounted thereon,a

part of said hollow shaft being within the platen, a stop on the platen, and a stop on the hollow shaft engaging said platen-stop, automatically operative to rotate the platen a predetermined total number of line-spaces less the number of linespaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form. t

12. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, and means comprising a central platen-shaft, a hollow cylindrical shaft rotatably mounted thereon, a part of said hollow shaft being within the platen, a stop on the platen, a stop on the hollow shaft engaging said platen-stop, a helical groove on the outside of said hollow shaft, and a member mounted on the frame, and adapted to travel in said groove and to cause the rotation of said hollow shaft in the line-spacing direction, automatber of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form.

13. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, and means comprising a central platen-shaft, a hollow cylindrical -shaft rotatably mounted thereon, a part of said hollow shaft being within the platen, a stop on the platen, a stop on the hollow shaft engaging said platen-stop, a helical groove on the outside of said hollow shaft. and a toothed wheel mounted on the frame, and adapted to travel in said groove and to-cause the rotation of said hollow shaft in the line-spacing direction, automatically operative to rotate the platen a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism} whereby in a continuous work-sheet the first line irrespective of the number of lines already imprinted on the preceding form.

14. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, and means comprising a central platen-shaft, a hollow cylindrical shaft rotatablymounted thereon, a part of said hollow shaft being within the platen, a stop on the platen, a stop on the hollow shaft engaging said platen-stop, a helical groove on the outside of said hollow shaft, a bracket mounted on the frame, said bracket supporting a toothed wheel, which has a part that travels in said groove, and a stop on said bracket, said wheel and said stop being movable with reference to each other to engaging and to disengaging l positions, automatically operative to rotate the platen a predetermined total number of linespaces less the number of line-spaces the platen ,has been already rotated by said line-spacing mechanism, whereby ina continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form.

15. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, and means comprising a central platen-shaft, a hollow cylindrical shaft rotatably mounted thereon, a part of said hollow shaft being within the platen, a stop on the platen, a stop on the hollow shaft engaging said platen-stop, a helical groove on the outside of said hollow shaft, a bracket mounted on the frame, said bracket supporting a toothed wheel, which has a part that travels in said groove, a stop on said bracket, said wheel and said stop being movable with reference to each other to engaging and to disengaging positions, and means for moving said wheel and saidstop into engaging position, automatically operative to rotate the platen a preedtermined total number of line-spaces less the number of line-"spaces the platen has been already rotated by said linespacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form.

16. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, and means comprising a central platen-shaft, a hollow cylindrical shaft rotatably mounted thereon, a' part of said hollow shaft being within the platen, a stop on the platema stop on the hollow shaft engaging said platen-stop, a helical groove on the outside of said hollow shaft, a bracket mounted on the frame, said bracket supporting a toothed wheel, which has a part that travels in said groove, a stop on said bracket, said wheel and said stop being movable with reference to each "other to engaging and to disengaging positions, and a key for permitting said wheel and 17. In a typewriter, in combination, a frame, a carriage mountedtfor reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, and means comprising a central platen-shaft, a hollow cylindrical shaft rotatably mounted thereon, a part of said hollow shaft being within the platen, a stop on the platen, a stop on the hollow shaft engaging said platen-stop, a helical groove on the outside of said hollow shaft, a bracket mounted on the frame, said bracket supporting a toothed wheel, which has apart that travels in said groove, and a stop on said bracket, said wheel and said stop being movable with reference to each other to engaging and to disengaging positions, automatically operative to rotate the platen a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form, and comprising a stop on said bracket which engages the platen to prevent overthrow of the platen.

18. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, and

means comprising a central platen-shaft, a shaft mounted thereon for rotation therewith and having a helical screw, and means mounted on the frame and coacting with said screw during the carriage return to line-space the platen.

19. In a typewriter, lg combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, and means comprising a\ central platenshaft, a shaft mounted thereon for'rotation therewith and having a helical screw, and means mounted on the frame, which by'the motion of the carriage return acts on said screw to line-space the platen.

20. In a typewriter, in combination, a frame,

, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, and means comprising a central platen-shaft, a hollow cylindrical shaft rotatably mounted thereon, a part of said hollow shaft being within the platen, a helical groove in the hollow shaft, and a stop pivoted on the platen so that it follows said groove, automatically operative to rotate the platen a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form.

21. In a typewriter, in combination, a frame, a carriage mounted .for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen comprising a detent-lever engaging the platen, a key, and means actuated by the key for releasing said detent-lever, during the initial return movement of the carriage.

22. In a typewriter, in combination, a frame, a carriage mounted for. reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen comprising a detent-lever engaging the platen, a key, and means actuated by 'the key for releasing said detent-lever and for locking said linespacing mechanism during the initial return movement of the carriage.

23. In a typewriter, in, combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon,

line-spacing mechanism operable by the return of the carriage for rotating the platen, formfeeding means optionally operable by a return of the carriage to rotate the platen a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form, and means actuated concomitantly with said formfeeding means to hold the line-spacing mechanism out of operative position during the form,- feeding operation.

24. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon and carrying a circumferential row of detent-teeth, line-spacing mechanism operable by the return of the carriage for rotating the platen and comprising a detent engaging said detent-teeth, formfeeding means optionally operable by a return of -the carriage to rotate the platen a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said line-specing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form, and means actuated simultaneously with said form-feeding means to hold the line-spacing detent out of contact with the platen detent-teeth and to hold the line-spacing mechanism out of operative position during the form-feeding operation.

25.'In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movementprising means to prevent overthrow of the platen line-spacing rotation.

26, In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen,

and means automatically operative to rotate theplaten a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective. of thenuniber. of lines already imprinted on the preceding form, comprising means to prevent overthrow of the platen line-spacing rotation which comprises a stop on the platen and a stop onsaid rotative means.

2'7. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, and means automatically operative to rotate the er-operated carriage-return mechanism,

platen a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form, comprising means to prevent overthrow of the platen line-spacing rotation which comprises a plurality of stops on the platen and a stop on said rotative means.

28. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, and means automatically operative to rotate the platen a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form, com prising means to prevent overthrow of the platen line-spacing rotation which comprises a stop on the platen and a stop on said rotative means, and means for disengaging said stops.

29. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, and means automatically operative to rotate the platen a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form, comprising means to prevent overthrow of the platen linespacing rotation which comprises a stop on the platen and a stop on said rotativemeans, and a spring for disengaging said stops.

30. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, powform-feeding means optionally operable by the power-operated carriage-return movement to rotate the platen a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous worksheet the first line of a succeeding form is automatically presented by means of said carriageretum mechanism and irrespective of the number of lines already imprinted on the preceding form, said form-feeding means including means differentially settable for varying the predetermined total number of line-spaces, whereby forms of difi'erent size may be used.

31. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, power-operated carriage-return mechanism, and form-feeding means optionally operable by a portion of the power-operated carriage-return movement to rotate the platen a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective and t of the number of lines already imprinted on the preceding form, said form-feeding means including a device adjustable for varying the extent of said form-feeding portion of the carriage-return movement, for varying the predetermined total number of line-spaces, whereby forms of different size may be used.

32. in a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, and means automatically operative to rotate the platen a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form, comprising a rod slidably mounted on the frame and a stop adjustably mounted on said rod for varying the predetermined total number of linespaces, whereby forms of different size may be used.

33. In a typewriter, in combiantion, a frame,

a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, a key, power-means made operative by said key for automatically returning the carriage by power, and means made operative by said key for rotating the platen, by means of the power carriage return, a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism.

34. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, a key, and means actuated by said key for automatically returning the carriage and for rotating the platen a predetermined total number of linespaces less the number of line spaces the platen has been already rotated by said line-spacing mechanism.

35. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon,

line-spacing mechanism for rotating the platen, a key, power-operated means made operative by said key in its depressed position for automatically returning the carriage by power and for concomitantly rotating the platen by power a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, means for holding said key depressed, and means on the carriage for automatically releasing said key from said holding means at a predetermined point in the carriage return travel.

36. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanismfor rotating the platen, a key, normally idle power-operated means conditionable by said key for automatically returning the carriage by power and for concomitantly rotating the platen by power a predetermined total number of line-spaces less the number of linespaces the platen has been already rotated by said line-spacing mechanism, and means enabling the carriage in its return movement to determine restoration of said power-operated means to idle condition.

' 37. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, power-operated carriage-return mechanism, a key, normally idle form-feeding means conditionable by said key, for rotating the platen by means of the power-operated carriagereturn movement a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, and means enabling the carriage in its return movement to determine restoration of said form-feeding means to idle condition.

38. Ina typewriter, in combination, a frame, a

carriage mounted for reciprocatory movement thereon and constantly urged to advance, a car riage-feed escapement normally controlling advance of said carriage, aplaten rotatably mounted on said carriage, line-spacing mechanism for rotating the platen, carriage-return mechanism automatically becoming active at a predetermined point in the carriage-advance, form-feeding means conditionable for rotating the platen by means of the carriage-return a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, a key, a connection enabling said key to release said carriage from said escapement for resulting jump to said point where the automatic carriage-return mechanism becomes active, and a connection enabling said key to condition said form-feeding means to be actuated by the return of the carriage.

39. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon and constantly urged to advance, a carriage-feed escapement normally controlling advance of said carriage, a platen rotatably mounted on said carriage, line-spacing mechanism normally operated by the return of the carriage for rotating the platen and comprising a platen-engaging detent, carriage-r eturn mechanism automatically becoming active at a predetermined point in the carriage-advance, normally idle iorm-feeding means conditionable, for operation by the return of the carriage, for rotating the platen a predetermined total number of linespaces less the number of line-spaces the platen has been ,already rotated by said line-spacing mechanism, a key, and connections enabling said key to (1) release the carriage from said escapement for resulting jump .to said point where the automatic carriage-return mechanism operates, (2)to condition said form-feeding means to be actuated by the return of the carriage, and (3) to retract said platen-engaging detent, and lock said line-spacing mechanism against operation during the form-feeding carriage-return.

40. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon and constantly urged to advance, a carriage-feed escapement normally controlling ad(- vance of said carriage, a platen rotatably mounted on said carriage, line-spacing mechanism normally operated by the return of the carriage for rotating the platen and comprising a platen-engaging detent, carriage-return mechanism automatically becoming active at a predetermined point in the carriage-advance, normally idle form-feeding means conditionable, for operation by the return of the carriage, for rotating the platen a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, a key, connections enabling said key to 1) release the carriage from said escapement for resulting jump to said point where the automatic carriage-return mechanism operates, (2) to condition said form-feeding means to be actuated by the return of the carriage, and (3) to retract said platen-engaging detent, and lock said line-spacing mechanism against operation during the form-feeding carriage-return, and means acting at a predetermined place in the return of the carriage to determine restoration of the carriage to the control of said escapement, restoration of the form-feeding means to idle condition, restoration of the platen-detent, and unlocking of the line-spacing mechanism.

41. In a typewriter, in combination, a frame, a

carriage mounted for reciprocatory movement thereon and constantly urged to advance, a carriage-feed escapement normally controlling advance of said carriage, a platen rotatably mounted on said carriage, line-spacing mechanism normally operated by the return of the carriage for rotating the platen and comprising a platen-engaging detent, carriage-return mechanism automatically becoming active at a predetermined point in the carriage-advance, normally idle form-feeding means conditionable, for operation by the return of the carriage, for rotating the platen a predetermined total number of line-spaces less the number of line-spaces the platen has been already rotated by said linespacing mechanism, a key, connections enabling said key to (1) release the carriage from said escapement for resulting jump to said point where the automatic carriage-return mechanism operates, (2) to condition said form-feeding means to be actuated by the return of the carriage, and (3) to retract said platen-engaging detent, and lock said line-spacing mechanism against operation during the form-feeding carriage-return, latching means becoming set upon operation of said key to keep said form-feeding means in active condition, to keep said platen-detent retracted, and to keep said line-spacing mechanism locked, and means enabling said carriage at a predetermined place in its return travel to trip said latching means to determine restoration of said forms, feeding means to idle condition, restoration of said platen-detent, and unlocking of said linespacing mechanism.

4,2. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen having a shaft and rotatably mounted thereon,'an automatic carriage-return mechanism having a carriage-return rack, an adjustable margin-stop for actuating said mechanism, an adjustable margin-stopfor stopping said mechanism, an escapement-feed rack, line-spacing mechanism comprising a platen-detent, a key mounted for actuation by the depression thereof, an arm-and a latch for holding said key depressed, a cam mounted on the carriage for releasing said arm from the latch, means operable movement of the carriage tending to interengage said toothed wheel and said frame-tooth, a

spring-retained pivoted tooth having a side engagement with said toothed wheel and movable by the depression of said key out of engagement with the side of said toothed wheel but into the path oi; the teeth thereon, mechanism connected with the line-spacing mechanism and the platendetent for locking and disengaging the same respectively, said carriage-cam releasing said arm from said latch after said locking and disengaging mechanism has become operative, said locking and disengaging mechanism being operative throughout the carriage-return, a spring-pressed tooth on the frame, a plurality of teeth on the platen,'said spring-pressed tooth engaging one of said teeth on the platen to prevent overthrow of the automatic platen-feed, and a spring which releases said spring-pressed tooth upon the letterspace drop-back of the carriage, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented irrespective of the number of lines already imprinted on the preceding form.

43. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, line-spacing mechanism for rotating the platen, power-operated carriage-return mechanism and means conditionable, and operable by the powerreturn of the carriage when conditioned, to rotate the platen a predetermined total number of linespaces less the number of line-spaces the platen has been already rotated by said line-spacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented by means of the power-operated carriage-return and irrespective of the number of lines already imprinted on the preceding form, said means being normally ineffective during power-return of the carriage.

44. In a typewriter, in combination, a frame, a carriage mounted for reciprocatory movement thereon, a platen rotatably mounted thereon, linespacing mechanism for rotating the platen, a power-operated carriage-return mechanism, a special key, and means conditioned upon the depression of the special key, and operable by the power-return oi the carriage when so conditioned, to rotate the platen a predetermined total number of line-spaces less'the number of line-spaces the platen has been already rotated by said linespacing mechanism, whereby in a continuous work-sheet the first line of a succeeding form is automatically presented by means of the poweroperated carriage-return and irrespective of the number of lines already printed on the preceding form.

45. In a typewriter, the combination of a frame, a carriage mounted for reciprocatory movement on said frame, a revoluble platen in said carriage, line-spacing mechanism for the platen,.poweroperated carriage-return mechanism, and formfeeding means for rotating the platen additionally to the line-spacing, including a rotor in said carriage, having an external screw-thread, a driving connection from said rotor to said platen, and means on said frame for engaging said screwthread, said screw-thread-engaging means being conditionable so as to co-operate with said screwthread to cause form-feeding rotation of said rotor and platen by a carriage-return movement effected by said carriage-return mechanism, said screw-threadengaging means being normally inefiective to rotate said rotor and platen during a carriage-return movement.

as. In a typewriter, the combination of a frame,

a carriage mounted for reciprooatory movement on said frame, a revoluble platen in said carriage, line-spacing mechanism for the platen, poweroperated carriage-return mechanism, and formfeeding means for rotating the platen additionally to the line-spacing including a rotor in said carriage, having an external screw-thread, a driving connection from said rotor to said platen, a rotatable nut constantly engaging said screw-thread, means on said frame serving to oppose lateral travel of said nut relative to said frame, wherefore said nut tends to rotate idly when said screwthreaded rotor reciprocates with said carriage relatively to said nut, and means conditionable at will to lock said nut to prevent its idle rotation during a power-driven return of said carriage, thereby to cause said rotor to be rotated and rotate said platen in form-feeding direction.

47. In a typewriter, the combination of a frame, a carriage mounted for reciprocatory movement on said frame, a revoluble platen in said carriage, line-spacing mechanism for the platen, poweroperated carriage-return mechanism, and formieeding means for rotating the platen additionally to the line-spacing including a rotor in said carriage, having an external screw-thread, a driving connection from said rotor to said platen, a rotatable nut constantly engaging said screwthread, means on said frame serving to oppose lateral travel of said nut relative to said frame, wherefore said nut tends to rotate idly when said screw-threaded rotor reciprocates with said carriage relatively to said nut, means conditionable at will to lock said nut to prevent its idle rotation during a power-driven return of said carriage, thereby to cause said rotor to be rotated and rotate said platen in form-feeding direction, said last-mentioned means being normally ineffective, and means acting during said powerdriven return of the carriage to determine restoration of said nut-locking means to normal ineffective condition following the form-feeding rotation of said platen.

48. In a typewriter, in combination, a letterfeedable and returnable carriage, a paper-feeding roller mounted in said carriage, a line-spacing mechanism for actuating said roller, a poweroperated carriage-return mechanism, a key operable to effect return of said carriage by said carriage-return mechanism, and normally idle roller-driving means conditioned by said key to be actuated instead of said line-spacing mechanism and concomitantly with the power-return of the carriage to rotate said roller for effecting an extra-extensive paper-advance.

49. In a typewriter, in combination, a letterfeedable and returnable carriage, a line-spaceable paper-feeding roller mounted in said carriage, a power-operated carriage-return mechanism, a key operable to efiect return of said carriage by said carriage-return mechanism, normally idle roller-driving means conditioned by said key to be driven by the power-returned carriage for effecting an extra-extensive paper-advance, and means differentially settableto utilize different portions of the carriage-return movement to drive said roller-driving means, whereby to predetermine the extent of said paper-advance.

50. The combination of a laterally reciprocable typing carriage having a line-spaceable paperfeeding roller, and roller-rotating means for effecting, at will, an extra-extensive sweep of paper-advance by means of the return-movement of the carriage, said means being normally ineffective during return or the carriage, and arranged so as to be partly conditioned for efiec tiveness by advancing the carriage to a particular position, said means including a key, means responsive to said key for advancing the carriage to said position, means responsive to said key to completely condition said roller-rotating means for efiectiveness, and power-operated means to return the carriage from said position and effect said extra-extensive sweep of paper-advance.

51. In a typewriter, in combination, a reciprocatory carriage, a revolubleplaten in the car-' 52. In a typewriter, in combination, a reciprocatory carriage, a revoluble platen in the carriage, a toothed detent wheel connected to said platen, a detent normally engaging said detent wheel to hold the platen in line space position, a rack movable relatively to and with the carriage, a key, means actuatable by said key to cause said rack to be driven to move relatively to said carriage and ensuingiy to return said carriage, line spacing mechanism for said platen normally operable by said rack in a latter stage of its movement relatively to the carriage, said stage being preceded by a normally idle stage of the rack movement relative to the carriage, means conditioned by said key to cause the returning carriage to efiect an extra-extensive rotation of said platen, means conditioned by said key to suppress'the line spacing stage of the rack movement relative to the carriage, and means conditioned by said key to cause said idle stage of the rack movement relatively tothe carriage to render said detent and, wheel inefiective. 

